Fix katze_widget_popup_position_menu for GTK+
Fix katze_widget_popup_position_menu for GTK+

The window NULL-check was wrong in any case. The
key issue here is that GtkEntry internals changed
in GTK+3 and we need to take that into account.


dokidokivisual/midori,dokidokivisual/midori,dokidokivisual/midori,dokidokivisual/midori,dokidokivisual/midori